Laerru (Sardinian: Laìrru) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 180 kilometres (110 mi) north of Cagliari and about 25 kilometres (16 mi) northeast of Sassari. As of 31 December 2004, it had a population of 988 and an area of 19.9 square kilometres (7.7 sq mi).
Laerru borders the following municipalities: Bulzi, Martis, Nulvi, Perfugas, Sedini.
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- ^ All demographics and other statistics: Italian statistical institute Istat.